Water injection.

If i had a wideband i would know but alas i dont. makes it abit harder to figure out. WI is water injection or Water methanol injection as i run it. And it is awsome. Do you guys realy think using a map sensor to run the safc would be the right idea i figure riging the stock ecu to read map sensor is abit more involved than that.

Given the interest in using the stock ecu with a MAP sensor (the IRTB guys on m.n want it too) I might look into designing something to do this once my thesis is done and the move back to Texas is complete. I havn't got time right now between the race team, thesis, and packing stuff up. PM me in Feb. and I might be able to supply you with an alpha level.

I hope i'm not totally off track but i'm just pulling this together with my experience with turbo Hondas.

You should be able to make 450ccs idle just fine with a afc unit, but trying to tune without a wideband is like flying blind folded. Also adding WI into the equation gets complicated.

Also, one thing to remember is that when using the afc on a map sensor (if you choose that route), ecu is gonna think that you are in a lower load level, which means increased ignition timming. So it might be a good idea to back the base timming down 1 or 2* to be on the safe side.

happy boosting.

Instead of using the TPS on the SAFC for TPS, you would be using it for MAP
V. The stock ecu would still only receive the VAF changes from the SAFC, allowing the SAFC to compensate for MAP V and RPM independently.

i like the map idea i might do that. i got some of the midrange sorted today by telling it i was running a 2 cylinder, this gave me abit more controll on midrange. but means i can only tune to 3700 rpm as my adjustments only allow me to tune to 7400 rpm. Our ecus dont pull time on laod man they just run set maps on rpm. The only way i will pull timming is if i get a ecu that can an then i might try 18 or so btdc and see if i like it. Will those 20$ map sensors be on the right scale to use, or will it matter? what about a 2 bar gm map sensor will that work as well?

magnam do u know how many cc/min your WI system sprays?

176 cc/min at 70 psi i run about 85 or so now 190 or so cc/min With a 25-30% methanol content by vollume

thanx

im puttin a kit together the adbradley cheep way...

im such a redneck rig-o-maniac

You are telling this to the guy from KY? comeon now if i can rig it and figure i can do it most of the time. I might try going back to 4 cyl mode and limit the scale to 5000 rpm i should be in closed loop there anyway. You guys keep on throwing me options i never thought of before.

What part of KY u from?? I used to live in southern IL

water injection, right thanks.

been thinking about looking into that actually.


*edit.

did a search and found your thread about WI. heaps of good info, thanks.

this sounds interesting. so are you saying that you can program some kind of look up table into the safc for the map v rpm = afm value ?

i am about an hour south of Louisville, i juggled the safc setting some more i am getting closer but i definatly need either a WBO2 or a couple of hours of dyno time to get it all right. still wieghing my options on them since 1= the cost of the other in the long term who knows maybe i will be surprised by one on my B day tommorow :bigtu: thanks for the ecuragement+ help guys

Well i just took it to work and back and all i can say is im going back to rrfpr and 1.8's. At this point i cant get it any better and it isnt even as good as the 1.8 setup until 14 psi and even then the horrible midrange, takes alot of fun out of it. I pull fuel a little no better i pull fuel alot a little worse, i add fuel a little no better i change my spring tension on the afm and no change. I am just going to go to the stuff that works and save the 460's for when i get a real em solution. So in summation it works just not all that well. :(

ok i got my 460cc's today. i have a couple of questions for you guys. the clips are a different shape so i need to cut the wires and solder the new clips on. does it matter which wire goes to which plug on the clip? i think i remember reading somewhere that it doesn't matter, but i want to be sure before i dive in.
also, looking at it, it looks like all i need to do is undo the 2 bolts on the fuel rail, lift the rail off, and swap the injectors out. is it as simple as that? any pitfalls i need to look out for ?
if there is a write-up on the net somewhere about this stuff, please point me in the right direction. i don't wanna f*ck this up!

I used bullet connectors so the changeback was easier the ingnition fuel injector harness comes of just back trace it and then unhook the temp sensor and another green sensor. I matched up the wires with the stockers side by side.

bullet connectors are probly a goood idea, yeah. thanks.

alrite i'm gonna have a crack at this tomorrow.

When you add the clips, solder them with jumper wire and leave the stock clips, if you ever want to swap, you'll have two options all ready available/ installed. (like upgrading to 550's).
Are you using ballast resistors?
Watch out for the three nylon/delrin space bushings under the fuel rail, they always seem to disappear when they fall under the car...

ok guys, after a lot of stuffing around today i got them in. man, i wish i had bought some injectors that fit onto the stock connectors. woulda saved a lot of effort.
anyway, she started up , running like a pig of course. did a quick 5 minute tune using the dfa in the driveway. then took the car out on the road, tweaking for about 20 minutes.
after i was happy that i was in the ballpark and the car was running nicely, i took it on a big drive (170 kilometres). went thru city traffic (stop start sorta stuff), open highway, and mountain twisties. the car ran great . i did this drive last week and got 8.8L p/100km fuel economy. i was expecting this to be worse with the new injectors, but this time around i got 8.3L p/100km !
i will continue to tweak the fuel map, but i think i'm 95% there. i must say i'm pretty pleased with myself today.
so anyway magnamx-5, don't give up on those 460cc's just yet mate!! if an idiot like me can get it to work, i reckon you can figure it out :)